A Rhodium(II)‐Catalyzed Formal [4+1]‐Cycloaddition toward Spirooxindole Pyrrolone Construction Employing Vinyl Isocyanates as 1,4‐Dipoles
作者:Jennifer L. Meloche、Brandon L. Ashfeld
DOI:10.1002/anie.201701147
日期:2017.6
A RhII-catalyzed, formal [4+1]-cycloaddition between diazooxindoles as electrophilic C1 synthons and 1,3-heterodienes for the construction of spirooxindole pyrrolones is described. Employing vinyl isocyanates as 1,4-dipoles, the cycloannulation occurs under relatively mild conditions and provides the corresponding pyrrolones in good to excellent yields.
描述了在作为亲电子C 1合成子的重氮恶吲哚与1,3-杂二烯之间的Rh II催化的正式[4 + 1]-环加成反应,用于构建螺恶吲哚吡咯烷酮。使用异氰酸乙烯基酯作为1,4-偶极,环化反应在相对温和的条件下发生,并以良好或极好的收率提供了相应的吡咯烷酮。